Process of producing sound metal castings.



suitability for forming R0 Drawing.

then to add small UNITED STATES rarENT OFFICE.

LUDWIG WEISS, 0F BARMEN, GERMANY.

PROCESS OF PRODUCING SOUND METAL CASTINGS.

Specification of Letters Patent. Patented J an. 24, 1911. Application filed September 15, 1910. Serial No. 582,225-

To all whom it may concern:

Be it known that I, LUDWIG lVnIss, citizen of Germany, residing at Barmen-Rittershausen, Germany, have im'ented certain new and useful Improvements in Processes for Producing Sound Metal Castings; and I do hereby declare the following to be a full, clear, and exact descri tion of the invention, such as will enable 0t iers skilled in the art to which it appertains to make and use the same.

For attaining sound metal castings it has en recommended to use strongly deoxidizing elements, among others, titanium. It has, however, been found dilficult to dissolve the same in metal baths and further considerable loss through waste is occasioned. Also, titanium possesses a relatively low combustion point, so that it does not extract the oxygen contained in the metal baths with sufcient energy. Further, the specific gravity of titanium is comparatively low, so that its alloys is decreased. Finally, alloys of titanium containing more than 2 to 3% of titanium are difiicult to work in the hot state. Investigations have proved that all these disadvantages can be avoided by using zirconium or combinations of zirconium with other deoxidizing or inactive substances, for instance, zirconiumcarbid, zirconium-silicid, ferric zirconium, cupriferous zirconium, or with the further addition of nickel, molybdenum, chrome or Wolfram.

The zirconium or the above-mentioned combinations and alloys can be added with the greatest ease to the molten metal, for instance, iron, gunmetal, brass, copper, aluminum-bronze or the like, and are totally dissolved in them.

It is advisable to prepare alloys of zirconium with a high percentage of zirconium, for instance, with 10 to 35% zirconium, and quantities of this'alloy to the molten metal. If it is only desired to attain a sound casting, very small additions of zirconium, less than 1%, are sufficient; these are enough to greatly increase the tenacity and strength of the metal. Greater additions of zirconium to the abovementioned metals and alloys will further increase the strength and tou hness of the products, and will further ren er them-more insensible to chemical agents Metals alloyed with zirconium, apart from the advantages already mentioned, have greater strength than those alloyed with titanium and are more proof 8. ainst acids. Further, many of the allo s wit possess great hardness an elasticit especially adapted for castings and constructive or engineering work.

From the above itwill be seen that my in-' vention in all cases consists in the addition of zirconium to the molten metal, the said addition being attended with the best results when such zirconium is introduced as the ingredient of an alloy or a mixture with other metals.

What I claim as my invention, and desire to secure by Letters Patent is:

The process of producing sound metal zirconium' castings, which consists in adding zirconium to the molten metal.

2. The process of producing sound metal castings, which consists in adding zirconium to the molten metal in the minimum amount of one per cent.

3. The process of producin sound metal castings, which consists in ad mg zirconium mixed with other metals to the molten casting metal.

4. The process of producing sound metal castings, which consists in adding zirconium mixed with other metals to the molten casting metal, the minimum quantity of the zirconium added being one per cent.

5. The process of producing sound metal castings, which consists in adding a zirconium alloy to the molten casting metal.

6. The process of roducirn sound metal castings, which conslsts in atding a zirconium alloy to the molten casting mean, the minimum amount of zirconium added being one per cent.

In testimony whereof I hereunto aflix my signature in the presence of two witnesses.

LUDW'IG WEISS. [n 8.] 

